1 /****************************************************************************** 2 * 3 * This file is provided under a dual BSD/GPLv2 license. When using or 4 * redistributing this file, you may do so under either license. 5 * 6 * GPL LICENSE SUMMARY 7 * 8 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 9 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 10 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of version 2 of the GNU General Public License as 14 * published by the Free Software Foundation. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * The full GNU General Public License is included in this distribution 22 * in the file called COPYING. 23 * 24 * Contact Information: 25 * Intel Linux Wireless <ilw@linux.intel.com> 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 27 * 28 * BSD LICENSE 29 * 30 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved. 31 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH 32 * Copyright(c) 2015 - 2016 Intel Deutschland GmbH 33 * All rights reserved. 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 39 * * Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * * Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in 43 * the documentation and/or other materials provided with the 44 * distribution. 45 * * Neither the name Intel Corporation nor the names of its 46 * contributors may be used to endorse or promote products derived 47 * from this software without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 50 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 51 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 52 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 53 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 54 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 55 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 56 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 57 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 59 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 60 *****************************************************************************/ 61 #include <linux/etherdevice.h> 62 #include <linux/skbuff.h> 63 #include "iwl-trans.h" 64 #include "mvm.h" 65 #include "fw-api.h" 66 #include "fw-dbg.h" 67 68 static inline int iwl_mvm_check_pn(struct iwl_mvm *mvm, struct sk_buff *skb, 69 int queue, struct ieee80211_sta *sta) 70 { 71 struct iwl_mvm_sta *mvmsta; 72 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 73 struct ieee80211_rx_status *stats = IEEE80211_SKB_RXCB(skb); 74 struct iwl_mvm_key_pn *ptk_pn; 75 u8 tid, keyidx; 76 u8 pn[IEEE80211_CCMP_PN_LEN]; 77 u8 *extiv; 78 79 /* do PN checking */ 80 81 /* multicast and non-data only arrives on default queue */ 82 if (!ieee80211_is_data(hdr->frame_control) || 83 is_multicast_ether_addr(hdr->addr1)) 84 return 0; 85 86 /* do not check PN for open AP */ 87 if (!(stats->flag & RX_FLAG_DECRYPTED)) 88 return 0; 89 90 /* 91 * avoid checking for default queue - we don't want to replicate 92 * all the logic that's necessary for checking the PN on fragmented 93 * frames, leave that to mac80211 94 */ 95 if (queue == 0) 96 return 0; 97 98 /* if we are here - this for sure is either CCMP or GCMP */ 99 if (IS_ERR_OR_NULL(sta)) { 100 IWL_ERR(mvm, 101 "expected hw-decrypted unicast frame for station\n"); 102 return -1; 103 } 104 105 mvmsta = iwl_mvm_sta_from_mac80211(sta); 106 107 extiv = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control); 108 keyidx = extiv[3] >> 6; 109 110 ptk_pn = rcu_dereference(mvmsta->ptk_pn[keyidx]); 111 if (!ptk_pn) 112 return -1; 113 114 if (ieee80211_is_data_qos(hdr->frame_control)) 115 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 116 else 117 tid = 0; 118 119 /* we don't use HCCA/802.11 QoS TSPECs, so drop such frames */ 120 if (tid >= IWL_MAX_TID_COUNT) 121 return -1; 122 123 /* load pn */ 124 pn[0] = extiv[7]; 125 pn[1] = extiv[6]; 126 pn[2] = extiv[5]; 127 pn[3] = extiv[4]; 128 pn[4] = extiv[1]; 129 pn[5] = extiv[0]; 130 131 if (memcmp(pn, ptk_pn->q[queue].pn[tid], 132 IEEE80211_CCMP_PN_LEN) <= 0) 133 return -1; 134 135 memcpy(ptk_pn->q[queue].pn[tid], pn, IEEE80211_CCMP_PN_LEN); 136 stats->flag |= RX_FLAG_PN_VALIDATED; 137 138 return 0; 139 } 140 141 /* iwl_mvm_create_skb Adds the rxb to a new skb */ 142 static void iwl_mvm_create_skb(struct sk_buff *skb, struct ieee80211_hdr *hdr, 143 u16 len, u8 crypt_len, 144 struct iwl_rx_cmd_buffer *rxb) 145 { 146 struct iwl_rx_packet *pkt = rxb_addr(rxb); 147 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 148 unsigned int headlen, fraglen, pad_len = 0; 149 unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); 150 151 if (desc->mac_flags2 & IWL_RX_MPDU_MFLG2_PAD) 152 pad_len = 2; 153 len -= pad_len; 154 155 /* If frame is small enough to fit in skb->head, pull it completely. 156 * If not, only pull ieee80211_hdr (including crypto if present, and 157 * an additional 8 bytes for SNAP/ethertype, see below) so that 158 * splice() or TCP coalesce are more efficient. 159 * 160 * Since, in addition, ieee80211_data_to_8023() always pull in at 161 * least 8 bytes (possibly more for mesh) we can do the same here 162 * to save the cost of doing it later. That still doesn't pull in 163 * the actual IP header since the typical case has a SNAP header. 164 * If the latter changes (there are efforts in the standards group 165 * to do so) we should revisit this and ieee80211_data_to_8023(). 166 */ 167 headlen = (len <= skb_tailroom(skb)) ? len : 168 hdrlen + crypt_len + 8; 169 170 /* The firmware may align the packet to DWORD. 171 * The padding is inserted after the IV. 172 * After copying the header + IV skip the padding if 173 * present before copying packet data. 174 */ 175 hdrlen += crypt_len; 176 memcpy(skb_put(skb, hdrlen), hdr, hdrlen); 177 memcpy(skb_put(skb, headlen - hdrlen), (u8 *)hdr + hdrlen + pad_len, 178 headlen - hdrlen); 179 180 fraglen = len - headlen; 181 182 if (fraglen) { 183 int offset = (void *)hdr + headlen + pad_len - 184 rxb_addr(rxb) + rxb_offset(rxb); 185 186 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 187 fraglen, rxb->truesize); 188 } 189 } 190 191 /* iwl_mvm_pass_packet_to_mac80211 - passes the packet for mac80211 */ 192 static void iwl_mvm_pass_packet_to_mac80211(struct iwl_mvm *mvm, 193 struct napi_struct *napi, 194 struct sk_buff *skb, int queue, 195 struct ieee80211_sta *sta) 196 { 197 if (iwl_mvm_check_pn(mvm, skb, queue, sta)) 198 kfree_skb(skb); 199 else 200 ieee80211_rx_napi(mvm->hw, sta, skb, napi); 201 } 202 203 static void iwl_mvm_get_signal_strength(struct iwl_mvm *mvm, 204 struct iwl_rx_mpdu_desc *desc, 205 struct ieee80211_rx_status *rx_status) 206 { 207 int energy_a, energy_b, max_energy; 208 209 energy_a = desc->energy_a; 210 energy_a = energy_a ? -energy_a : S8_MIN; 211 energy_b = desc->energy_b; 212 energy_b = energy_b ? -energy_b : S8_MIN; 213 max_energy = max(energy_a, energy_b); 214 215 IWL_DEBUG_STATS(mvm, "energy In A %d B %d, and max %d\n", 216 energy_a, energy_b, max_energy); 217 218 rx_status->signal = max_energy; 219 rx_status->chains = 0; /* TODO: phy info */ 220 rx_status->chain_signal[0] = energy_a; 221 rx_status->chain_signal[1] = energy_b; 222 rx_status->chain_signal[2] = S8_MIN; 223 } 224 225 static int iwl_mvm_rx_crypto(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr, 226 struct ieee80211_rx_status *stats, 227 struct iwl_rx_mpdu_desc *desc, int queue, 228 u8 *crypt_len) 229 { 230 u16 status = le16_to_cpu(desc->status); 231 232 if (!ieee80211_has_protected(hdr->frame_control) || 233 (status & IWL_RX_MPDU_STATUS_SEC_MASK) == 234 IWL_RX_MPDU_STATUS_SEC_NONE) 235 return 0; 236 237 /* TODO: handle packets encrypted with unknown alg */ 238 239 switch (status & IWL_RX_MPDU_STATUS_SEC_MASK) { 240 case IWL_RX_MPDU_STATUS_SEC_CCM: 241 case IWL_RX_MPDU_STATUS_SEC_GCM: 242 BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != IEEE80211_GCMP_PN_LEN); 243 /* alg is CCM: check MIC only */ 244 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 245 return -1; 246 247 stats->flag |= RX_FLAG_DECRYPTED; 248 *crypt_len = IEEE80211_CCMP_HDR_LEN; 249 return 0; 250 case IWL_RX_MPDU_STATUS_SEC_TKIP: 251 /* Don't drop the frame and decrypt it in SW */ 252 if (!(status & IWL_RX_MPDU_RES_STATUS_TTAK_OK)) 253 return 0; 254 255 *crypt_len = IEEE80211_TKIP_IV_LEN; 256 /* fall through if TTAK OK */ 257 case IWL_RX_MPDU_STATUS_SEC_WEP: 258 if (!(status & IWL_RX_MPDU_STATUS_ICV_OK)) 259 return -1; 260 261 stats->flag |= RX_FLAG_DECRYPTED; 262 if ((status & IWL_RX_MPDU_STATUS_SEC_MASK) == 263 IWL_RX_MPDU_STATUS_SEC_WEP) 264 *crypt_len = IEEE80211_WEP_IV_LEN; 265 return 0; 266 case IWL_RX_MPDU_STATUS_SEC_EXT_ENC: 267 if (!(status & IWL_RX_MPDU_STATUS_MIC_OK)) 268 return -1; 269 stats->flag |= RX_FLAG_DECRYPTED; 270 return 0; 271 default: 272 IWL_ERR(mvm, "Unhandled alg: 0x%x\n", status); 273 } 274 275 return 0; 276 } 277 278 static void iwl_mvm_rx_csum(struct ieee80211_sta *sta, 279 struct sk_buff *skb, 280 struct iwl_rx_mpdu_desc *desc) 281 { 282 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 283 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif); 284 u16 flags = le16_to_cpu(desc->l3l4_flags); 285 u8 l3_prot = (u8)((flags & IWL_RX_L3L4_L3_PROTO_MASK) >> 286 IWL_RX_L3_PROTO_POS); 287 288 if (mvmvif->features & NETIF_F_RXCSUM && 289 flags & IWL_RX_L3L4_TCP_UDP_CSUM_OK && 290 (flags & IWL_RX_L3L4_IP_HDR_CSUM_OK || 291 l3_prot == IWL_RX_L3_TYPE_IPV6 || 292 l3_prot == IWL_RX_L3_TYPE_IPV6_FRAG)) 293 skb->ip_summed = CHECKSUM_UNNECESSARY; 294 } 295 296 /* 297 * returns true if a packet outside BA session is a duplicate and 298 * should be dropped 299 */ 300 static bool iwl_mvm_is_nonagg_dup(struct ieee80211_sta *sta, int queue, 301 struct ieee80211_rx_status *rx_status, 302 struct ieee80211_hdr *hdr, 303 struct iwl_rx_mpdu_desc *desc) 304 { 305 struct iwl_mvm_sta *mvm_sta; 306 struct iwl_mvm_rxq_dup_data *dup_data; 307 u8 baid, tid, sub_frame_idx; 308 309 if (WARN_ON(IS_ERR_OR_NULL(sta))) 310 return false; 311 312 baid = (le32_to_cpu(desc->reorder_data) & 313 IWL_RX_MPDU_REORDER_BAID_MASK) >> 314 IWL_RX_MPDU_REORDER_BAID_SHIFT; 315 316 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 317 return false; 318 319 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 320 dup_data = &mvm_sta->dup_data[queue]; 321 322 /* 323 * Drop duplicate 802.11 retransmissions 324 * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") 325 */ 326 if (ieee80211_is_ctl(hdr->frame_control) || 327 ieee80211_is_qos_nullfunc(hdr->frame_control) || 328 is_multicast_ether_addr(hdr->addr1)) { 329 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 330 return false; 331 } 332 333 if (ieee80211_is_data_qos(hdr->frame_control)) 334 /* frame has qos control */ 335 tid = *ieee80211_get_qos_ctl(hdr) & 336 IEEE80211_QOS_CTL_TID_MASK; 337 else 338 tid = IWL_MAX_TID_COUNT; 339 340 /* If this wasn't a part of an A-MSDU the sub-frame index will be 0 */ 341 sub_frame_idx = desc->amsdu_info & IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 342 343 if (unlikely(ieee80211_has_retry(hdr->frame_control) && 344 dup_data->last_seq[tid] == hdr->seq_ctrl && 345 dup_data->last_sub_frame[tid] >= sub_frame_idx)) 346 return true; 347 348 dup_data->last_seq[tid] = hdr->seq_ctrl; 349 dup_data->last_sub_frame[tid] = sub_frame_idx; 350 351 rx_status->flag |= RX_FLAG_DUP_VALIDATED; 352 353 return false; 354 } 355 356 int iwl_mvm_notify_rx_queue(struct iwl_mvm *mvm, u32 rxq_mask, 357 const u8 *data, u32 count) 358 { 359 struct iwl_rxq_sync_cmd *cmd; 360 u32 data_size = sizeof(*cmd) + count; 361 int ret; 362 363 /* should be DWORD aligned */ 364 if (WARN_ON(count & 3 || count > IWL_MULTI_QUEUE_SYNC_MSG_MAX_SIZE)) 365 return -EINVAL; 366 367 cmd = kzalloc(data_size, GFP_KERNEL); 368 if (!cmd) 369 return -ENOMEM; 370 371 cmd->rxq_mask = cpu_to_le32(rxq_mask); 372 cmd->count = cpu_to_le32(count); 373 cmd->flags = 0; 374 memcpy(cmd->payload, data, count); 375 376 ret = iwl_mvm_send_cmd_pdu(mvm, 377 WIDE_ID(DATA_PATH_GROUP, 378 TRIGGER_RX_QUEUES_NOTIF_CMD), 379 0, data_size, cmd); 380 381 kfree(cmd); 382 return ret; 383 } 384 385 /* 386 * Returns true if sn2 - buffer_size < sn1 < sn2. 387 * To be used only in order to compare reorder buffer head with NSSN. 388 * We fully trust NSSN unless it is behind us due to reorder timeout. 389 * Reorder timeout can only bring us up to buffer_size SNs ahead of NSSN. 390 */ 391 static bool iwl_mvm_is_sn_less(u16 sn1, u16 sn2, u16 buffer_size) 392 { 393 return ieee80211_sn_less(sn1, sn2) && 394 !ieee80211_sn_less(sn1, sn2 - buffer_size); 395 } 396 397 #define RX_REORDER_BUF_TIMEOUT_MQ (HZ / 10) 398 399 static void iwl_mvm_release_frames(struct iwl_mvm *mvm, 400 struct ieee80211_sta *sta, 401 struct napi_struct *napi, 402 struct iwl_mvm_reorder_buffer *reorder_buf, 403 u16 nssn) 404 { 405 u16 ssn = reorder_buf->head_sn; 406 407 lockdep_assert_held(&reorder_buf->lock); 408 409 /* ignore nssn smaller than head sn - this can happen due to timeout */ 410 if (iwl_mvm_is_sn_less(nssn, ssn, reorder_buf->buf_size)) 411 return; 412 413 while (iwl_mvm_is_sn_less(ssn, nssn, reorder_buf->buf_size)) { 414 int index = ssn % reorder_buf->buf_size; 415 struct sk_buff_head *skb_list = &reorder_buf->entries[index]; 416 struct sk_buff *skb; 417 418 ssn = ieee80211_sn_inc(ssn); 419 420 /* holes are valid since nssn indicates frames were received. */ 421 if (skb_queue_empty(skb_list) || !skb_peek_tail(skb_list)) 422 continue; 423 /* Empty the list. Will have more than one frame for A-MSDU */ 424 while ((skb = __skb_dequeue(skb_list))) { 425 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, 426 reorder_buf->queue, 427 sta); 428 reorder_buf->num_stored--; 429 } 430 } 431 reorder_buf->head_sn = nssn; 432 433 if (reorder_buf->num_stored && !reorder_buf->removed) { 434 u16 index = reorder_buf->head_sn % reorder_buf->buf_size; 435 436 while (!skb_peek_tail(&reorder_buf->entries[index])) 437 index = (index + 1) % reorder_buf->buf_size; 438 /* modify timer to match next frame's expiration time */ 439 mod_timer(&reorder_buf->reorder_timer, 440 reorder_buf->reorder_time[index] + 1 + 441 RX_REORDER_BUF_TIMEOUT_MQ); 442 } else { 443 del_timer(&reorder_buf->reorder_timer); 444 } 445 } 446 447 void iwl_mvm_reorder_timer_expired(unsigned long data) 448 { 449 struct iwl_mvm_reorder_buffer *buf = (void *)data; 450 int i; 451 u16 sn = 0, index = 0; 452 bool expired = false; 453 454 spin_lock_bh(&buf->lock); 455 456 if (!buf->num_stored || buf->removed) { 457 spin_unlock_bh(&buf->lock); 458 return; 459 } 460 461 for (i = 0; i < buf->buf_size ; i++) { 462 index = (buf->head_sn + i) % buf->buf_size; 463 464 if (!skb_peek_tail(&buf->entries[index])) 465 continue; 466 if (!time_after(jiffies, buf->reorder_time[index] + 467 RX_REORDER_BUF_TIMEOUT_MQ)) 468 break; 469 expired = true; 470 sn = ieee80211_sn_add(buf->head_sn, i + 1); 471 } 472 473 if (expired) { 474 struct ieee80211_sta *sta; 475 476 rcu_read_lock(); 477 sta = rcu_dereference(buf->mvm->fw_id_to_mac_id[buf->sta_id]); 478 /* SN is set to the last expired frame + 1 */ 479 IWL_DEBUG_HT(buf->mvm, 480 "Releasing expired frames for sta %u, sn %d\n", 481 buf->sta_id, sn); 482 iwl_mvm_release_frames(buf->mvm, sta, NULL, buf, sn); 483 rcu_read_unlock(); 484 } else if (buf->num_stored) { 485 /* 486 * If no frame expired and there are stored frames, index is now 487 * pointing to the first unexpired frame - modify timer 488 * accordingly to this frame. 489 */ 490 mod_timer(&buf->reorder_timer, 491 buf->reorder_time[index] + 492 1 + RX_REORDER_BUF_TIMEOUT_MQ); 493 } 494 spin_unlock_bh(&buf->lock); 495 } 496 497 static void iwl_mvm_del_ba(struct iwl_mvm *mvm, int queue, 498 struct iwl_mvm_delba_data *data) 499 { 500 struct iwl_mvm_baid_data *ba_data; 501 struct ieee80211_sta *sta; 502 struct iwl_mvm_reorder_buffer *reorder_buf; 503 u8 baid = data->baid; 504 505 if (WARN_ON_ONCE(baid >= IWL_RX_REORDER_DATA_INVALID_BAID)) 506 return; 507 508 rcu_read_lock(); 509 510 ba_data = rcu_dereference(mvm->baid_map[baid]); 511 if (WARN_ON_ONCE(!ba_data)) 512 goto out; 513 514 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 515 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 516 goto out; 517 518 reorder_buf = &ba_data->reorder_buf[queue]; 519 520 /* release all frames that are in the reorder buffer to the stack */ 521 spin_lock_bh(&reorder_buf->lock); 522 iwl_mvm_release_frames(mvm, sta, NULL, reorder_buf, 523 ieee80211_sn_add(reorder_buf->head_sn, 524 reorder_buf->buf_size)); 525 spin_unlock_bh(&reorder_buf->lock); 526 del_timer_sync(&reorder_buf->reorder_timer); 527 528 out: 529 rcu_read_unlock(); 530 } 531 532 void iwl_mvm_rx_queue_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb, 533 int queue) 534 { 535 struct iwl_rx_packet *pkt = rxb_addr(rxb); 536 struct iwl_rxq_sync_notification *notif; 537 struct iwl_mvm_internal_rxq_notif *internal_notif; 538 539 notif = (void *)pkt->data; 540 internal_notif = (void *)notif->payload; 541 542 if (internal_notif->sync) { 543 if (mvm->queue_sync_cookie != internal_notif->cookie) { 544 WARN_ONCE(1, 545 "Received expired RX queue sync message\n"); 546 return; 547 } 548 atomic_dec(&mvm->queue_sync_counter); 549 } 550 551 switch (internal_notif->type) { 552 case IWL_MVM_RXQ_EMPTY: 553 break; 554 case IWL_MVM_RXQ_NOTIF_DEL_BA: 555 iwl_mvm_del_ba(mvm, queue, (void *)internal_notif->data); 556 break; 557 default: 558 WARN_ONCE(1, "Invalid identifier %d", internal_notif->type); 559 } 560 } 561 562 /* 563 * Returns true if the MPDU was buffered\dropped, false if it should be passed 564 * to upper layer. 565 */ 566 static bool iwl_mvm_reorder(struct iwl_mvm *mvm, 567 struct napi_struct *napi, 568 int queue, 569 struct ieee80211_sta *sta, 570 struct sk_buff *skb, 571 struct iwl_rx_mpdu_desc *desc) 572 { 573 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 574 struct iwl_mvm_sta *mvm_sta; 575 struct iwl_mvm_baid_data *baid_data; 576 struct iwl_mvm_reorder_buffer *buffer; 577 struct sk_buff *tail; 578 u32 reorder = le32_to_cpu(desc->reorder_data); 579 bool amsdu = desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU; 580 bool last_subframe = 581 desc->amsdu_info & IWL_RX_MPDU_AMSDU_LAST_SUBFRAME; 582 u8 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; 583 u8 sub_frame_idx = desc->amsdu_info & 584 IWL_RX_MPDU_AMSDU_SUBFRAME_IDX_MASK; 585 int index; 586 u16 nssn, sn; 587 u8 baid; 588 589 baid = (reorder & IWL_RX_MPDU_REORDER_BAID_MASK) >> 590 IWL_RX_MPDU_REORDER_BAID_SHIFT; 591 592 if (baid == IWL_RX_REORDER_DATA_INVALID_BAID) 593 return false; 594 595 /* no sta yet */ 596 if (WARN_ON(IS_ERR_OR_NULL(sta))) 597 return false; 598 599 mvm_sta = iwl_mvm_sta_from_mac80211(sta); 600 601 /* not a data packet */ 602 if (!ieee80211_is_data_qos(hdr->frame_control) || 603 is_multicast_ether_addr(hdr->addr1)) 604 return false; 605 606 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) 607 return false; 608 609 baid_data = rcu_dereference(mvm->baid_map[baid]); 610 if (WARN(!baid_data, 611 "Received baid %d, but no data exists for this BAID\n", baid)) 612 return false; 613 if (WARN(tid != baid_data->tid || mvm_sta->sta_id != baid_data->sta_id, 614 "baid 0x%x is mapped to sta:%d tid:%d, but was received for sta:%d tid:%d\n", 615 baid, baid_data->sta_id, baid_data->tid, mvm_sta->sta_id, 616 tid)) 617 return false; 618 619 nssn = reorder & IWL_RX_MPDU_REORDER_NSSN_MASK; 620 sn = (reorder & IWL_RX_MPDU_REORDER_SN_MASK) >> 621 IWL_RX_MPDU_REORDER_SN_SHIFT; 622 623 buffer = &baid_data->reorder_buf[queue]; 624 625 spin_lock_bh(&buffer->lock); 626 627 /* 628 * If there was a significant jump in the nssn - adjust. 629 * If the SN is smaller than the NSSN it might need to first go into 630 * the reorder buffer, in which case we just release up to it and the 631 * rest of the function will take of storing it and releasing up to the 632 * nssn 633 */ 634 if (!iwl_mvm_is_sn_less(nssn, buffer->head_sn + buffer->buf_size, 635 buffer->buf_size)) { 636 u16 min_sn = ieee80211_sn_less(sn, nssn) ? sn : nssn; 637 638 iwl_mvm_release_frames(mvm, sta, napi, buffer, min_sn); 639 } 640 641 /* drop any oudated packets */ 642 if (ieee80211_sn_less(sn, buffer->head_sn)) 643 goto drop; 644 645 /* release immediately if allowed by nssn and no stored frames */ 646 if (!buffer->num_stored && ieee80211_sn_less(sn, nssn)) { 647 if (iwl_mvm_is_sn_less(buffer->head_sn, nssn, 648 buffer->buf_size) && 649 (!amsdu || last_subframe)) 650 buffer->head_sn = nssn; 651 /* No need to update AMSDU last SN - we are moving the head */ 652 spin_unlock_bh(&buffer->lock); 653 return false; 654 } 655 656 index = sn % buffer->buf_size; 657 658 /* 659 * Check if we already stored this frame 660 * As AMSDU is either received or not as whole, logic is simple: 661 * If we have frames in that position in the buffer and the last frame 662 * originated from AMSDU had a different SN then it is a retransmission. 663 * If it is the same SN then if the subframe index is incrementing it 664 * is the same AMSDU - otherwise it is a retransmission. 665 */ 666 tail = skb_peek_tail(&buffer->entries[index]); 667 if (tail && !amsdu) 668 goto drop; 669 else if (tail && (sn != buffer->last_amsdu || 670 buffer->last_sub_index >= sub_frame_idx)) 671 goto drop; 672 673 /* put in reorder buffer */ 674 __skb_queue_tail(&buffer->entries[index], skb); 675 buffer->num_stored++; 676 buffer->reorder_time[index] = jiffies; 677 678 if (amsdu) { 679 buffer->last_amsdu = sn; 680 buffer->last_sub_index = sub_frame_idx; 681 } 682 683 /* 684 * We cannot trust NSSN for AMSDU sub-frames that are not the last. 685 * The reason is that NSSN advances on the first sub-frame, and may 686 * cause the reorder buffer to advance before all the sub-frames arrive. 687 * Example: reorder buffer contains SN 0 & 2, and we receive AMSDU with 688 * SN 1. NSSN for first sub frame will be 3 with the result of driver 689 * releasing SN 0,1, 2. When sub-frame 1 arrives - reorder buffer is 690 * already ahead and it will be dropped. 691 * If the last sub-frame is not on this queue - we will get frame 692 * release notification with up to date NSSN. 693 */ 694 if (!amsdu || last_subframe) 695 iwl_mvm_release_frames(mvm, sta, napi, buffer, nssn); 696 697 spin_unlock_bh(&buffer->lock); 698 return true; 699 700 drop: 701 kfree_skb(skb); 702 spin_unlock_bh(&buffer->lock); 703 return true; 704 } 705 706 static void iwl_mvm_agg_rx_received(struct iwl_mvm *mvm, u8 baid) 707 { 708 unsigned long now = jiffies; 709 unsigned long timeout; 710 struct iwl_mvm_baid_data *data; 711 712 rcu_read_lock(); 713 714 data = rcu_dereference(mvm->baid_map[baid]); 715 if (WARN_ON(!data)) 716 goto out; 717 718 if (!data->timeout) 719 goto out; 720 721 timeout = data->timeout; 722 /* 723 * Do not update last rx all the time to avoid cache bouncing 724 * between the rx queues. 725 * Update it every timeout. Worst case is the session will 726 * expire after ~ 2 * timeout, which doesn't matter that much. 727 */ 728 if (time_before(data->last_rx + TU_TO_JIFFIES(timeout), now)) 729 /* Update is atomic */ 730 data->last_rx = now; 731 732 out: 733 rcu_read_unlock(); 734 } 735 736 void iwl_mvm_rx_mpdu_mq(struct iwl_mvm *mvm, struct napi_struct *napi, 737 struct iwl_rx_cmd_buffer *rxb, int queue) 738 { 739 struct ieee80211_rx_status *rx_status; 740 struct iwl_rx_packet *pkt = rxb_addr(rxb); 741 struct iwl_rx_mpdu_desc *desc = (void *)pkt->data; 742 struct ieee80211_hdr *hdr = (void *)(pkt->data + sizeof(*desc)); 743 u32 len = le16_to_cpu(desc->mpdu_len); 744 u32 rate_n_flags = le32_to_cpu(desc->rate_n_flags); 745 u16 phy_info = le16_to_cpu(desc->phy_info); 746 struct ieee80211_sta *sta = NULL; 747 struct sk_buff *skb; 748 u8 crypt_len = 0; 749 750 /* Dont use dev_alloc_skb(), we'll have enough headroom once 751 * ieee80211_hdr pulled. 752 */ 753 skb = alloc_skb(128, GFP_ATOMIC); 754 if (!skb) { 755 IWL_ERR(mvm, "alloc_skb failed\n"); 756 return; 757 } 758 759 rx_status = IEEE80211_SKB_RXCB(skb); 760 761 if (iwl_mvm_rx_crypto(mvm, hdr, rx_status, desc, queue, &crypt_len)) { 762 kfree_skb(skb); 763 return; 764 } 765 766 /* 767 * Keep packets with CRC errors (and with overrun) for monitor mode 768 * (otherwise the firmware discards them) but mark them as bad. 769 */ 770 if (!(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_CRC_OK)) || 771 !(desc->status & cpu_to_le16(IWL_RX_MPDU_STATUS_OVERRUN_OK))) { 772 IWL_DEBUG_RX(mvm, "Bad CRC or FIFO: 0x%08X.\n", 773 le16_to_cpu(desc->status)); 774 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 775 } 776 /* set the preamble flag if appropriate */ 777 if (phy_info & IWL_RX_MPDU_PHY_SHORT_PREAMBLE) 778 rx_status->flag |= RX_FLAG_SHORTPRE; 779 780 if (likely(!(phy_info & IWL_RX_MPDU_PHY_TSF_OVERLOAD))) { 781 rx_status->mactime = le64_to_cpu(desc->tsf_on_air_rise); 782 /* TSF as indicated by the firmware is at INA time */ 783 rx_status->flag |= RX_FLAG_MACTIME_PLCP_START; 784 } 785 rx_status->device_timestamp = le32_to_cpu(desc->gp2_on_air_rise); 786 rx_status->band = desc->channel > 14 ? NL80211_BAND_5GHZ : 787 NL80211_BAND_2GHZ; 788 rx_status->freq = ieee80211_channel_to_frequency(desc->channel, 789 rx_status->band); 790 iwl_mvm_get_signal_strength(mvm, desc, rx_status); 791 792 /* update aggregation data for monitor sake on default queue */ 793 if (!queue && (phy_info & IWL_RX_MPDU_PHY_AMPDU)) { 794 bool toggle_bit = phy_info & IWL_RX_MPDU_PHY_AMPDU_TOGGLE; 795 796 rx_status->flag |= RX_FLAG_AMPDU_DETAILS; 797 rx_status->ampdu_reference = mvm->ampdu_ref; 798 /* toggle is switched whenever new aggregation starts */ 799 if (toggle_bit != mvm->ampdu_toggle) { 800 mvm->ampdu_ref++; 801 mvm->ampdu_toggle = toggle_bit; 802 } 803 } 804 805 rcu_read_lock(); 806 807 if (le16_to_cpu(desc->status) & IWL_RX_MPDU_STATUS_SRC_STA_FOUND) { 808 u8 id = desc->sta_id_flags & IWL_RX_MPDU_SIF_STA_ID_MASK; 809 810 if (!WARN_ON_ONCE(id >= IWL_MVM_STATION_COUNT)) { 811 sta = rcu_dereference(mvm->fw_id_to_mac_id[id]); 812 if (IS_ERR(sta)) 813 sta = NULL; 814 } 815 } else if (!is_multicast_ether_addr(hdr->addr2)) { 816 /* 817 * This is fine since we prevent two stations with the same 818 * address from being added. 819 */ 820 sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL); 821 } 822 823 if (sta) { 824 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); 825 struct ieee80211_vif *tx_blocked_vif = 826 rcu_dereference(mvm->csa_tx_blocked_vif); 827 u8 baid = (u8)((le32_to_cpu(desc->reorder_data) & 828 IWL_RX_MPDU_REORDER_BAID_MASK) >> 829 IWL_RX_MPDU_REORDER_BAID_SHIFT); 830 831 /* 832 * We have tx blocked stations (with CS bit). If we heard 833 * frames from a blocked station on a new channel we can 834 * TX to it again. 835 */ 836 if (unlikely(tx_blocked_vif) && 837 tx_blocked_vif == mvmsta->vif) { 838 struct iwl_mvm_vif *mvmvif = 839 iwl_mvm_vif_from_mac80211(tx_blocked_vif); 840 841 if (mvmvif->csa_target_freq == rx_status->freq) 842 iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, 843 false); 844 } 845 846 rs_update_last_rssi(mvm, &mvmsta->lq_sta, rx_status); 847 848 if (iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_RSSI) && 849 ieee80211_is_beacon(hdr->frame_control)) { 850 struct iwl_fw_dbg_trigger_tlv *trig; 851 struct iwl_fw_dbg_trigger_low_rssi *rssi_trig; 852 bool trig_check; 853 s32 rssi; 854 855 trig = iwl_fw_dbg_get_trigger(mvm->fw, 856 FW_DBG_TRIGGER_RSSI); 857 rssi_trig = (void *)trig->data; 858 rssi = le32_to_cpu(rssi_trig->rssi); 859 860 trig_check = 861 iwl_fw_dbg_trigger_check_stop(mvm, mvmsta->vif, 862 trig); 863 if (trig_check && rx_status->signal < rssi) 864 iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL); 865 } 866 867 if (ieee80211_is_data(hdr->frame_control)) 868 iwl_mvm_rx_csum(sta, skb, desc); 869 870 if (iwl_mvm_is_nonagg_dup(sta, queue, rx_status, hdr, desc)) { 871 kfree_skb(skb); 872 rcu_read_unlock(); 873 return; 874 } 875 876 /* 877 * Our hardware de-aggregates AMSDUs but copies the mac header 878 * as it to the de-aggregated MPDUs. We need to turn off the 879 * AMSDU bit in the QoS control ourselves. 880 */ 881 if ((desc->mac_flags2 & IWL_RX_MPDU_MFLG2_AMSDU) && 882 !WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) { 883 u8 *qc = ieee80211_get_qos_ctl(hdr); 884 885 *qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT; 886 } 887 if (baid != IWL_RX_REORDER_DATA_INVALID_BAID) 888 iwl_mvm_agg_rx_received(mvm, baid); 889 } 890 891 /* Set up the HT phy flags */ 892 switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) { 893 case RATE_MCS_CHAN_WIDTH_20: 894 break; 895 case RATE_MCS_CHAN_WIDTH_40: 896 rx_status->flag |= RX_FLAG_40MHZ; 897 break; 898 case RATE_MCS_CHAN_WIDTH_80: 899 rx_status->vht_flag |= RX_VHT_FLAG_80MHZ; 900 break; 901 case RATE_MCS_CHAN_WIDTH_160: 902 rx_status->vht_flag |= RX_VHT_FLAG_160MHZ; 903 break; 904 } 905 if (rate_n_flags & RATE_MCS_SGI_MSK) 906 rx_status->flag |= RX_FLAG_SHORT_GI; 907 if (rate_n_flags & RATE_HT_MCS_GF_MSK) 908 rx_status->flag |= RX_FLAG_HT_GF; 909 if (rate_n_flags & RATE_MCS_LDPC_MSK) 910 rx_status->flag |= RX_FLAG_LDPC; 911 if (rate_n_flags & RATE_MCS_HT_MSK) { 912 u8 stbc = (rate_n_flags & RATE_MCS_HT_STBC_MSK) >> 913 RATE_MCS_STBC_POS; 914 rx_status->flag |= RX_FLAG_HT; 915 rx_status->rate_idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK; 916 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 917 } else if (rate_n_flags & RATE_MCS_VHT_MSK) { 918 u8 stbc = (rate_n_flags & RATE_MCS_VHT_STBC_MSK) >> 919 RATE_MCS_STBC_POS; 920 rx_status->vht_nss = 921 ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >> 922 RATE_VHT_MCS_NSS_POS) + 1; 923 rx_status->rate_idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK; 924 rx_status->flag |= RX_FLAG_VHT; 925 rx_status->flag |= stbc << RX_FLAG_STBC_SHIFT; 926 if (rate_n_flags & RATE_MCS_BF_MSK) 927 rx_status->vht_flag |= RX_VHT_FLAG_BF; 928 } else { 929 rx_status->rate_idx = 930 iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags, 931 rx_status->band); 932 } 933 934 /* management stuff on default queue */ 935 if (!queue) { 936 if (unlikely((ieee80211_is_beacon(hdr->frame_control) || 937 ieee80211_is_probe_resp(hdr->frame_control)) && 938 mvm->sched_scan_pass_all == 939 SCHED_SCAN_PASS_ALL_ENABLED)) 940 mvm->sched_scan_pass_all = SCHED_SCAN_PASS_ALL_FOUND; 941 942 if (unlikely(ieee80211_is_beacon(hdr->frame_control) || 943 ieee80211_is_probe_resp(hdr->frame_control))) 944 rx_status->boottime_ns = ktime_get_boot_ns(); 945 } 946 947 iwl_mvm_create_skb(skb, hdr, len, crypt_len, rxb); 948 if (!iwl_mvm_reorder(mvm, napi, queue, sta, skb, desc)) 949 iwl_mvm_pass_packet_to_mac80211(mvm, napi, skb, queue, sta); 950 rcu_read_unlock(); 951 } 952 953 void iwl_mvm_rx_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi, 954 struct iwl_rx_cmd_buffer *rxb, int queue) 955 { 956 struct iwl_rx_packet *pkt = rxb_addr(rxb); 957 struct iwl_frame_release *release = (void *)pkt->data; 958 struct ieee80211_sta *sta; 959 struct iwl_mvm_reorder_buffer *reorder_buf; 960 struct iwl_mvm_baid_data *ba_data; 961 962 int baid = release->baid; 963 964 IWL_DEBUG_HT(mvm, "Frame release notification for BAID %u, NSSN %d\n", 965 release->baid, le16_to_cpu(release->nssn)); 966 967 if (WARN_ON_ONCE(baid == IWL_RX_REORDER_DATA_INVALID_BAID)) 968 return; 969 970 rcu_read_lock(); 971 972 ba_data = rcu_dereference(mvm->baid_map[baid]); 973 if (WARN_ON_ONCE(!ba_data)) 974 goto out; 975 976 sta = rcu_dereference(mvm->fw_id_to_mac_id[ba_data->sta_id]); 977 if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) 978 goto out; 979 980 reorder_buf = &ba_data->reorder_buf[queue]; 981 982 spin_lock_bh(&reorder_buf->lock); 983 iwl_mvm_release_frames(mvm, sta, napi, reorder_buf, 984 le16_to_cpu(release->nssn)); 985 spin_unlock_bh(&reorder_buf->lock); 986 987 out: 988 rcu_read_unlock(); 989 } 990